/*
|
* Copyright (c) 2010 Serge A. Zaitsev
|
*
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
* of this software and associated documentation files (the "Software"), to deal
|
* in the Software without restriction, including without limitation the rights
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
* copies of the Software, and to permit persons to whom the Software is
|
* furnished to do so, subject to the following conditions:
|
*
|
* The above copyright notice and this permission notice shall be included in
|
* all copies or substantial portions of the Software.
|
*
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
* THE SOFTWARE.
|
*
|
* Slightly modified by AK to not assume 0 terminated input.
|
*/
|
|
#include <stdlib.h>
|
#include "jsmn.h"
|
|
/*
|
* Allocates a fresh unused token from the token pool.
|
*/
|
static jsmntok_t *jsmn_alloc_token(jsmn_parser *parser,
|
jsmntok_t *tokens, size_t num_tokens)
|
{
|
jsmntok_t *tok;
|
|
if ((unsigned)parser->toknext >= num_tokens)
|
return NULL;
|
tok = &tokens[parser->toknext++];
|
tok->start = tok->end = -1;
|
tok->size = 0;
|
return tok;
|
}
|
|
/*
|
* Fills token type and boundaries.
|
*/
|
static void jsmn_fill_token(jsmntok_t *token, jsmntype_t type,
|
int start, int end)
|
{
|
token->type = type;
|
token->start = start;
|
token->end = end;
|
token->size = 0;
|
}
|
|
/*
|
* Fills next available token with JSON primitive.
|
*/
|
static jsmnerr_t jsmn_parse_primitive(jsmn_parser *parser, const char *js,
|
size_t len,
|
jsmntok_t *tokens, size_t num_tokens)
|
{
|
jsmntok_t *token;
|
int start;
|
|
start = parser->pos;
|
|
for (; parser->pos < len; parser->pos++) {
|
switch (js[parser->pos]) {
|
#ifndef JSMN_STRICT
|
/*
|
* In strict mode primitive must be followed by ","
|
* or "}" or "]"
|
*/
|
case ':':
|
#endif
|
case '\t':
|
case '\r':
|
case '\n':
|
case ' ':
|
case ',':
|
case ']':
|
case '}':
|
goto found;
|
default:
|
break;
|
}
|
if (js[parser->pos] < 32 || js[parser->pos] >= 127) {
|
parser->pos = start;
|
return JSMN_ERROR_INVAL;
|
}
|
}
|
#ifdef JSMN_STRICT
|
/*
|
* In strict mode primitive must be followed by a
|
* comma/object/array.
|
*/
|
parser->pos = start;
|
return JSMN_ERROR_PART;
|
#endif
|
|
found:
|
token = jsmn_alloc_token(parser, tokens, num_tokens);
|
if (token == NULL) {
|
parser->pos = start;
|
return JSMN_ERROR_NOMEM;
|
}
|
jsmn_fill_token(token, JSMN_PRIMITIVE, start, parser->pos);
|
parser->pos--; /* parent sees closing brackets */
|
return JSMN_SUCCESS;
|
}
|
|
/*
|
* Fills next token with JSON string.
|
*/
|
static jsmnerr_t jsmn_parse_string(jsmn_parser *parser, const char *js,
|
size_t len,
|
jsmntok_t *tokens, size_t num_tokens)
|
{
|
jsmntok_t *token;
|
int start = parser->pos;
|
|
/* Skip starting quote */
|
parser->pos++;
|
|
for (; parser->pos < len; parser->pos++) {
|
char c = js[parser->pos];
|
|
/* Quote: end of string */
|
if (c == '\"') {
|
token = jsmn_alloc_token(parser, tokens, num_tokens);
|
if (token == NULL) {
|
parser->pos = start;
|
return JSMN_ERROR_NOMEM;
|
}
|
jsmn_fill_token(token, JSMN_STRING, start+1,
|
parser->pos);
|
return JSMN_SUCCESS;
|
}
|
|
/* Backslash: Quoted symbol expected */
|
if (c == '\\') {
|
parser->pos++;
|
switch (js[parser->pos]) {
|
/* Allowed escaped symbols */
|
case '\"':
|
case '/':
|
case '\\':
|
case 'b':
|
case 'f':
|
case 'r':
|
case 'n':
|
case 't':
|
break;
|
/* Allows escaped symbol \uXXXX */
|
case 'u':
|
/* TODO */
|
break;
|
/* Unexpected symbol */
|
default:
|
parser->pos = start;
|
return JSMN_ERROR_INVAL;
|
}
|
}
|
}
|
parser->pos = start;
|
return JSMN_ERROR_PART;
|
}
|
|
/*
|
* Parse JSON string and fill tokens.
|
*/
|
jsmnerr_t jsmn_parse(jsmn_parser *parser, const char *js, size_t len,
|
jsmntok_t *tokens, unsigned int num_tokens)
|
{
|
jsmnerr_t r;
|
int i;
|
jsmntok_t *token;
|
|
for (; parser->pos < len; parser->pos++) {
|
char c;
|
jsmntype_t type;
|
|
c = js[parser->pos];
|
switch (c) {
|
case '{':
|
case '[':
|
token = jsmn_alloc_token(parser, tokens, num_tokens);
|
if (token == NULL)
|
return JSMN_ERROR_NOMEM;
|
if (parser->toksuper != -1)
|
tokens[parser->toksuper].size++;
|
token->type = (c == '{' ? JSMN_OBJECT : JSMN_ARRAY);
|
token->start = parser->pos;
|
parser->toksuper = parser->toknext - 1;
|
break;
|
case '}':
|
case ']':
|
type = (c == '}' ? JSMN_OBJECT : JSMN_ARRAY);
|
for (i = parser->toknext - 1; i >= 0; i--) {
|
token = &tokens[i];
|
if (token->start != -1 && token->end == -1) {
|
if (token->type != type)
|
return JSMN_ERROR_INVAL;
|
parser->toksuper = -1;
|
token->end = parser->pos + 1;
|
break;
|
}
|
}
|
/* Error if unmatched closing bracket */
|
if (i == -1)
|
return JSMN_ERROR_INVAL;
|
for (; i >= 0; i--) {
|
token = &tokens[i];
|
if (token->start != -1 && token->end == -1) {
|
parser->toksuper = i;
|
break;
|
}
|
}
|
break;
|
case '\"':
|
r = jsmn_parse_string(parser, js, len, tokens,
|
num_tokens);
|
if (r < 0)
|
return r;
|
if (parser->toksuper != -1)
|
tokens[parser->toksuper].size++;
|
break;
|
case '\t':
|
case '\r':
|
case '\n':
|
case ':':
|
case ',':
|
case ' ':
|
break;
|
#ifdef JSMN_STRICT
|
/*
|
* In strict mode primitives are:
|
* numbers and booleans.
|
*/
|
case '-':
|
case '0':
|
case '1':
|
case '2':
|
case '3':
|
case '4':
|
case '5':
|
case '6':
|
case '7':
|
case '8':
|
case '9':
|
case 't':
|
case 'f':
|
case 'n':
|
#else
|
/*
|
* In non-strict mode every unquoted value
|
* is a primitive.
|
*/
|
/*FALL THROUGH */
|
default:
|
#endif
|
r = jsmn_parse_primitive(parser, js, len, tokens,
|
num_tokens);
|
if (r < 0)
|
return r;
|
if (parser->toksuper != -1)
|
tokens[parser->toksuper].size++;
|
break;
|
|
#ifdef JSMN_STRICT
|
/* Unexpected char in strict mode */
|
default:
|
return JSMN_ERROR_INVAL;
|
#endif
|
}
|
}
|
|
for (i = parser->toknext - 1; i >= 0; i--) {
|
/* Unmatched opened object or array */
|
if (tokens[i].start != -1 && tokens[i].end == -1)
|
return JSMN_ERROR_PART;
|
}
|
|
return JSMN_SUCCESS;
|
}
|
|
/*
|
* Creates a new parser based over a given buffer with an array of tokens
|
* available.
|
*/
|
void jsmn_init(jsmn_parser *parser)
|
{
|
parser->pos = 0;
|
parser->toknext = 0;
|
parser->toksuper = -1;
|
}
|
|
const char *jsmn_strerror(jsmnerr_t err)
|
{
|
switch (err) {
|
case JSMN_ERROR_NOMEM:
|
return "No enough tokens";
|
case JSMN_ERROR_INVAL:
|
return "Invalid character inside JSON string";
|
case JSMN_ERROR_PART:
|
return "The string is not a full JSON packet, more bytes expected";
|
case JSMN_SUCCESS:
|
return "Success";
|
default:
|
return "Unknown json error";
|
}
|
}
|
